OAKLAND — Coach Jack Del Rio said X-rays were negative on Derek Carr”s injured right hand, but other than that there wasn”t any specific information on the Raiders” sidelined quarterback.

Carr left the game in the second quarter after injuring the hand while trying to stiff-arm Cincinnati Bengals cornerback Adam Jones. Carr went to the locker room shortly after wincing in pain while trying to make a warm-up throw and never returned to the field.

The Raiders did not make Carr available to the media after the game, a 33-13 loss.

“I really don”t have a lot of information,” Del Rio said.

Del Rio didn”t have any estimate of how long the Raiders could be without their quarterback and didn”t want to get into speculating if the team would need to bring another player in. Matt McGloin is the only other quarterback on the active roster.

“There”s no reason to speculate on all that,” Del Rio said. “Obviously, if there”s any length of time then yes, we would.”

McCloin completed 23 of 31 passes for 142 yards and two fourth-quarter touchdowns once the game was out of reach. He also had one interception.

“It”s unfortunate anytime your starting quarterback goes out with an injury,” McGloin said. “But a backup”s job is to be ready. Be ready mentally, be ready physically to go in there and do the best job he can.”

McGloin didn”t know anything about Carr”s status yet but said a week of working with the starting offense would be helpful if he is called into duty next week against the Baltimore Ravens.

“If I do have to play this week, it”ll be good to get a week”s work with the first-team offense and correct some of the things we did wrong when I was in there,” McGloin said.